Incandescent electric lamp



(No Model.)

G. A. PREI. INGANDESOBNT ELEOTRIG LAMP.

No. 487,477. Patented D60. 6, 1892.

lJNtTED STATES PATENT Demon.

GUSTAV A. FRET, OF SPRINGFIELD, MASSACHUSETTS.

INCANDE SCENT ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 487,477, dated December 6, 1892.

Application filed March 14, 1892. Serial No. 424,835. (No model.)

To all whom it may concern.-

Be it known that I, GUSTAV A. Fauna citizen of the United States, residing at Springfield, in the county of Hampden and State of Massachusetts, have invented new and useful Improvements in Incandescent Electric Lamps, of which the following is a specification.

This invention relates to incandescent electric lamps, the object being to provide improved means for renewing the incandescing filament thereof; and the invention consists in improved means for securing the new filament to the leading-in wires of the lamp, all as hereinafter fully set forth, and more particularly pointed out in the claim.

In the drawings forming part of this specification, Figure 1 represents in perspective View an incandescent electric lamp, showing a new filament applied to the ends of the leading-in wires and means for manipulating said filament for the purpose of securing it to said wires according to my invention, all as fully described below. Fig. 2 illustrates the united ends of the leading-in wires and the new filament, showing the new joint.

In the drawings, A represents the globe of an ordinary incandescent lamp, in the lower end of which an opening 3 is made for the purpose of removing an old filament for cleaning the bulb and the leading-in wires and for inserting and securing a new filament to the leading-in wires 0. The lampis held in the horizontal position shown, so that it can be conveniently manipulated, preferably by inserting its neck into a socket B, supported on a stand, as shown, the latter being suitably secured to a convenient work-bench. To prepare the ends of the leading-in wires 0 to receive the ends of the new filament d, each of the ends of said wires has a loop or coil 6 formed thereon, in which the ends of said filament d are inserted, as shown. To provide means for conveniently and safely supporting said filament (Z in the lamp-globe while it shall be secured to the wires 0, a suitable table D is provided, consisting of two main members 4, which are pivotally united at 5. Said members 4 are so formed as to cause the ends thereof within the globe A to be slightly spread by the action of a spring 6 therebetween when the outer ends thereof are free,

leading-in Wires 0.

thereby forming a support for the filament of sufficient width on which it may rest. To the inner end of each of said members 4 is hung a leg 7, preferably having more or less friction at its pivot connection to the end that the free ends of said legs may be swung outwardly at more or less of an angle to the members 4, thereby providing means for adjusting the inner end of the table up or down (as the lamplies) to bring its surface in a line with the Each of said members i has a leg 8 on its outer end, the lower ends of which rest on the before-mentioned bench on which the lamp is placed. Thus it is seen how the table is supported to hold the filament in the position shown. Said table D is preferably provided with two small handles 9, attached to its legs 8 to make it more convenient to open the outer ends of said table members 4, whereby their inner ends are brought side to side for the purpose of removing the table from the globe A and of inserting the same therein. The parts shown in the drawings are manipulated as follows to arrange them as illustrated in Fig. 1:

The lamp the filament of which is to be renewed has first the opening 3 made therein. The leading-in wires have then their ends looped or coiled, as stated. The lampis then placed in the supporting-socket B, as shown, and the table D is placed therein. The filament by the aid of suitable pinchers is then placed on the table D in the lamp, with its ends inserted in said loops or coils e, which in practice are made slightly larger than the ends of the filament. The filament cl having been placed in the lamp-globe, as above set forth, a cement known to electricians as carbon cement, consisting of carbonaceous matters and a bronze powder, is applied to the coiled portions of the leadingin wires and the ends of the filament therein by the use of a brush 10, held as shown. Said cement is allowed to dry and the joint 10 is completed. The table D is then removed and the opening 3 of the globe A is closed by fusion, the air of course having first been exhausted in the welLknown manner.

It is necessary in the process of renewing the filament above described to permit the table to remain in its supporting position horizontally under the filament until the cement at the new joint shall have become hard, for handle members with the legs 8 S, and the 10 otherwise the weight of the filament would spring for normally insuring the divergence causeitto swing downwardly to ruin thejoint, of said members 4, but permitting the apand also finally leave the filament at one side proached relations thereof, substantially as 5 of the lamp. described.

\Vhat I claim as my invention is GUSTAV A. FREI. The filament-supporting device consisting Witnesses: of a table having the pivotally-united diverg- T. F. DENEEN,

ent members 4 4 with thehinged legs 7 7, the H. A. OHAPIN. 

